The "treaty" would seek to put multiple outstanding issues that Trump has railed against into one box: Iran's ballistic missile program, the "sunset clauses" that ease limits on Iran's centrifuges and nuclear enrichment under the current deal, and even Iran's behavior in regional conflicts like the ones in Yemen and Syria.
Speaking to a joint meeting of Congress, amid frequent standing ovations and cheers, Macron recalled the long history of US-French relations, and the countries' shared values and culture in areas as diverse as democracy and freedom, human and civil rights, literature, jazz and the "Me Too" movement.
In their different ways, Europe, Iran and Russian Federation are all seeking to convince US President Donald Trump not to abandon the landmark 2015 deal that curbed Iran's nuclear program in exchange for sanctions relief.
Yet a handful of thorny global issues are on the table as the two leaders meet, most notably the Iran nuclear deal and Western involvement in the ongoing civil war in Syria. Under US law, the President has to recertify the agreement every few months. "It can be tempting to us as a temporary remedy to our fears", Mr Macron said.
He also addressed a point made by others - that withdrawing would undermine United States leverage and credibility in coming talks with North Korea about eliminating its nuclear weapons. But he added that he could support "a new deal" if it was strong enough.
He was responding to statements in Washington by French President Emmanuel Macron and his USA counterpart Donald Trump, in which they proposed a new deal with tougher restrictions on Iran. But Macron indicated that Trump was willing to work on a more expansive agreement.
France's President Emmanuel Macron urged the United States to embrace multilateralism and warned of the perils of trade war, in an address to Congress pushing back against President Donald Trump's "America First" agenda.
"My view - I don't know what your president will decide - is that he will get rid of this deal on his own, for domestic reasons", Macron said.
Macron and Trump have forged what appears to be an affectionate relationship as newly elected outsiders.
Trump has been a consistent critic of the global agreement, calling the 2015 pact "insane" and "ridiculous".
"He is flawless", Trump added.
Lawmakers are widely expected, for example, to change the frequency with which Trump has to report to Congress that Iran is complying with the pact.
In an apparent reference to his friendly meetings this week with Trump, he said, "It can remind you of something". "Clearly a lot of thought is going into how to keep a non-US version", said Johnson.
Last week, Iran's foreign minister, Mohammad Javad Zarif, said Iran is prepared if the US walks away from the deal. "If you just kill the JCPOA, without an option, you'll just open a Pandora's box", he said.
"I hope that everyone at both ends of Pennsylvania Avenue takes President Macron's words to heart", Schumer said on the Senate floor. "I'm not a masochist. We think that there are no alternatives". The United States is the one who invented this multilateralism.